/Engine/Plugins/2D/Paper2D/Source/Paper2D/Classes/PaperFlipbookComponent.h
Get the nominal framerate that the flipbook will be played back at (ignoring PlayRate), in frames per second
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Components|Flipbook") float GetFlipbookFramerate() const